|No.|Date|Tournament|Winning score|Margin of victory|Runner(s)-up|
|---|---|---|---|---|---|
|1|May 27, 1956|Dallas Centennial Open|−12 (64-67-70-67=268)|1 stroke|Dow Finsterwald, Doug Ford|
|2|Feb 21, 1960|Tucson Open Invitational|−9 (67-67-68-69=271)|3 strokes|Bob Harris|
|3|Jul 9, 1961|St. Paul Open Invitational|−19 (66-71-68-64=269)|1 stroke|Buster Cupit|
|4|Feb 17, 1963|Tucson Open Invitational|−22 (65-67-69-65=266)|11 strokes|Gene Littler, Phil Rodgers|
|5|Aug 28, 1966|Philadelphia Golf Classic|−10 (69-69-68-71=278)|1 stroke|Jack Nicklaus|
|6|Jul 24, 1967|PGA Championship|−7 (71-72-70-68=281)|Playoff|Don Massengale|
|7|Apr 21, 1968|Tournament of Champions|−8 (70-68-69-69=276)|1 stroke|Julius Boros|
|8|Mar 23, 1970|Greater Jacksonville Open|−9 (68-75-70-66=279)|Playoff|Dale Douglass|
|9|Oct 19, 1975|San Antonio Texas Open|−13 (71-67-71-66=275)|Playoff|Larry Hinson|
|10|Apr 18, 1976|MONY Tournament of Champions|−11 (71-68-69-69=277)|5 strokes|Hubert Green|

Question: what is the difference of winning score between the san antonio texas open and the dallas centennial open?
Answer: 1